You can replace a Chevy key fob battery yourself in about five minutes with no tools
Most Chevy key fobs use a coin-cell battery—usually a CR2032 or CR2025—that you can swap out at home without taking the fob apart. The battery sits in a slot behind a removable cover on the back of the fob. You push or slide the cover off, lift out the old battery, drop in a new one (making sure the flat side faces up), and snap the cover back on. The whole job takes longer to find the right battery at a store than to install it.
The exact steps depend on whether your fob has a slide-off back cover or a hinged one, but both designs open without prying or force. If your fob is cracked or the cover won't budge, that is the time to call a Chevy dealer or locksmith—but for a working fob, this is a straightforward swap.
Key Takeaways
- Chevy key fobs use a CR2032 or CR2025 coin-cell battery that you can buy at any drugstore, supermarket, or hardware store for two to five dollars.
- The battery compartment is on the back of the fob and opens by sliding or hinging the cover—no screwdriver or prying required.
- When you install the new battery, the flat positive side must face up toward the cover, or the fob will not work.
- If the fob still does not work after you replace the battery, the problem is likely a worn button contact or water damage, and a dealer can diagnose it.
Finding the right battery for your Chevy key fob
The most common battery in Chevy key fobs is the CR2032, a 3-volt lithium coin cell about the size of a dime. Some older or smaller Chevy fobs use a CR2025, which is slightly thinner but the same diameter. Both are sold everywhere—drugstores, supermarkets, hardware stores, and online retailers all stock them. You do not need a special "car" battery; a standard CR2032 from any brand works fine.
If you are not sure which one your fob uses, open the back cover and look at the battery that is already in there. The battery type is printed on the flat side. Write it down or take a photo, then buy the same type. A CR2032 costs between two and five dollars, depending on the brand and where you buy it.
How to open a Chevy key fob with a slide-off back cover
Most newer Chevy key fobs have a back cover that slides off rather than hinges. Look at the back of your fob and find the seam where the cover meets the body. On one side of that seam, you will see a small notch or groove—this is where you push or slide the cover.
Place your thumbnail in the notch and push or slide the cover toward the edge of the fob. It should move smoothly without resistance. If it does not budge, you are pushing in the wrong spot—try the other side of the fob. Once the cover slides off, you will see the battery sitting in a plastic slot. Lift it out gently with your fingernail or a plastic spoon (not a metal tool, which can scratch the contacts).
How to open a Chevy key fob with a hinged back cover
Some older Chevy fobs have a back cover that hinges open like a book. Look for a thin seam running along one edge of the back. This is the hinge. Place your thumbnail in the seam on the opposite edge and gently pry the cover open. It should swing up without much force—if you feel strong resistance, stop and check that you are prying on the right edge.
Once the cover opens, the battery will be visible in its slot. Lift it out carefully. If the battery is stuck, do not force it; a small amount of corrosion or debris may be holding it. Gently wiggle it side to side as you lift, or use a plastic spoon to nudge it free.
Installing the new battery correctly
Before you put the new battery in, look at the slot where it sits. You will see a small metal contact on one side and a flat metal surface on the other. The battery has a flat positive side (marked with a + symbol) and a domed negative side. The flat positive side must face up toward the cover, and the domed side must rest on the metal contact at the bottom of the slot.
Drop the new battery into the slot with the flat side up. It should sit flat and level. If it rocks or tilts, you have it upside down—flip it over. Once it is seated correctly, slide or hinge the cover back on. You should hear or feel a small click when the cover closes. Press a button on the fob to test it. If the lights flash and the fob responds, the battery is installed correctly.
What to do if the fob still does not work after replacing the battery
If you installed the battery correctly (flat side up) and the fob still does not work, the problem is not the battery. The most common cause is worn button contacts—the rubber pads under the buttons wear smooth over time and stop making electrical contact. Water damage is another possibility, especially if the fob has been dropped in water or exposed to moisture for a long time.
A Chevy dealer can test the fob and replace the button pad or circuit board if needed. A locksmith who works with car keys can often do the same repair for less money. If the fob is very old or the repair cost is high, buying a replacement fob from a dealer or online retailer may be cheaper. Dealer fobs usually cost between 200 and 400 dollars, but aftermarket fobs are often 50 to 150 dollars and work just as well.
Keeping your key fob battery healthy
Coin-cell batteries in key fobs typically last three to four years with normal use. You can extend that life by keeping the fob away from extreme heat, moisture, and direct sunlight. Do not leave it in a hot car or in a pocket where it gets sat on repeatedly. If you drop the fob in water, dry it thoroughly with a soft cloth and let it air-dry for a few hours before using it again.
When the battery starts to die, you will notice the fob has to be held closer to the car to work, or you have to press the buttons harder. These are signs the battery is weakening. Replace it at that point rather than waiting for the fob to stop working entirely, because a dead fob can leave you locked out of your car.
Frequently Asked Questions
Can I use a rechargeable battery in my Chevy key fob?
No. Rechargeable coin-cell batteries (NiMH) have a lower voltage than alkaline or lithium batteries and will not power the fob reliably. Stick with a standard CR2032 or CR2025 alkaline or lithium battery. They are cheap enough that recharging is not worth the trouble.
What if I put the battery in upside down?
The fob will not work. The flat positive side must face the cover. If you installed it and the fob did not respond, open the cover again and flip the battery over. It should work when ready after you close the cover.
Do I need to reprogram my key fob after changing the battery?
No. Replacing the battery does not erase the fob's programming. As soon as you install the new battery and close the cover, the fob should work exactly as it did before. If it does not, the problem is the battery installation or a damaged fob, not lost programming.
Where is the cheapest place to buy a CR2032 battery?
Drugstores and supermarkets usually have the lowest prices—often two to three dollars per battery. Buying a multi-pack (four or eight batteries) is cheaper per battery than buying one. Online retailers like Amazon are competitive too, but you have to wait for shipping.
Can I use any brand of CR2032 battery?
Yes. All CR2032 batteries meet the same voltage and size standard. Brand-name batteries (Duracell, Energizer) and store brands work equally well in a key fob. The difference in price is not worth paying extra for a premium brand.